Well-boring tool



.Buy l 1924.

W. J. RCGERS WELL BORING Tom.

Filed Mrch 50 1923 3 Sheets-Sheet 2 WITNESSES A HJM WJ @gag/as I By -MJU/Uaw t W. J. ROGERS WELL BORING TooL Filed March 30 -l1923 Z0 ZI W/TA/ESSES 3 Sheets-Sheet 3 Figli?.

naasten any i, iaaa -WALTER JOHN RQGERS, OF HOUSTON, TEXAS.

WELL-BOM@- TGOL.

Application med March 30, 19234. Serial No. 628,372.

To au whom it may concern:

Be it known that l, WALTER J. Roanne, a citizen of the United States, and a resident kof Houston, in the county of Harris and State of Texas, have invented a new and Improved Well-Boring Tool, of which the following is a full, clear, and exact description,

This invention relates to improvements in well boring tools, and has particular reference to a reamer.

An object of the invention is to facilitate the operation of enlarging the bore or well opening by providing an improved construction which obviates the necessity of employing a sectional well casing, the sections of which are of different diameters.

Another object is the provision of a toolwhich may be readily passed through the well casing both when lowering the tool into the bore, or withdrawing it therefrom, this being accomplished by an improved construction which permits of the cutters or reamers automatically expanding when the tool has reached thebottom of the bore and contracting when drawing the tool upwardly through the well casing.

The above and other objects will appear more clearly from the following detail description, when taken in connection with the accompanying drawings, which illustrates a preferred embodiment of the inventive idea.

lin the drawings- Figure 1 is a longitudinal section through the tool showing the same in operative position' F igure 2 is a 'similar view taken on the line 2-2 of Figure 9, showing the parts in inoperative position;

Figure 3 'is a section on`the line 3-3 of Figure 2;

Fi re i is a section on the line -li of Flgure 2;

Figure 5 is an elevation of one section of the body of the tool;

Figure 6 is a side elevation, partlywin section, of one of the reamers or cutters employed;

Figure 7 is a-view at right angles to Figure 6;

Figure 9 is a side elevation of the tool I taken at right angles to Figure 8, and showing the parts in inoperative position;

Figure 10 is a section on the line 10-10 of Figure 2; and

Figure 1l is a section on the line ll-ll of Figure 2.

Referring more particularly to the accompanying drawings, the numerals 2O and 21 indicate generally the two sections of the body of the tool which are substantially complements of each other and which, when secured together by means of a plurality of dowel pins and bolts 22, provide a body which is substantially lcylindrical in formation. rlhe upper end of each section of the body is reduced and screw threaded, as indicatedpat 23, for the purpose of securing a drill rod thereto, as indicated in dotted lines in Figures l and 2, which rod is utilized for the purpose of rotating the body of Ithe tool in the customary manner. The sections 20 and 21 are provided with opposed recesses 24 in their inner opposed faces and in each of the opposed recesses there is pivotally mounted a reanier arm 25, which is supported in position by means of a bolt 26, which is also utilized for securing the sections of the body together. The free end of each arm 25 is bifurcated, as indicated at 27, the bifurcated portion having openings through which a stub shaft 28 extends and upon which the reamer or cutter 29 is rotatably mounted. The shaft 28 may be provided with a longitudinally extending lubricant passage 30 having small ports 3l communicating therewith whereby the lubricant may pass outwardly and lubricate the bearing surface of the cutter.

Means are provided in connection with the invention for moving the reamers 29 about their pivots 26 and laterally with respect to the body of the tool so that the reamers may be made to assume their op i is slidably mounted in a longitudinallyrethe bottom of the bore.

cess 34 formed by registering grooves in the lower portions of the sections 20 and 21 of the body. The head of the spreader 32 is preferably provided with a screw threaded connection to the shank 33, as shown at 35, so that the head may be readily removed and replaced Whenever desired. The lower end of the head of the spreader is provided with corresponding inclined surfaces which engage shoulders 36 formed upon the sections 20 and 21 at the up er end of the recess 34 so as to support t e spreader when in its normal position, as shown in Figure 2. vThe eective spreading end of the spreader 32 is provided with oppositely disposed inclined grooves 37, the bottoms of which are formed by a plurality of liners 38, which are detachably secured in position by means of screws 39 so that the number of liners may be varied to change the depth of the 'grooves 37. This is done for the purpose of regulating the amount of outward movement to operative position of the reamers 29, the inner ends of the arms of which are adapted to engage in the grooves 37 as the reamers are being-adjusted to their cutting positions, as shown in Figure 1. The lower end of the shank 33 of the spreader is reduced, as indicated at 40, and

is designed to support the head 41 of the tool, to which the usual bit 42 is attached. The upper end of the head 41 is provided with a recess 43, in which an externally screw threaded nut 44 is mounted and through which the portion 40 of the shank 33 extends.. -The portion 40 carries a nut 45 between which and the bottom of the recess 43 a coil spring 46 is interposed, which exerts an upward pressure upon the shank 33 to maintain the head of the spreader in Vyieldable support for the spreader when in its operative position shown in Figure 1.

The sections 20 and'21 of the body are provided at their lower ends with depending portions 47 which form an opening 48 in the lower end of the body for receiving the reduced upper end of the head 41 when the body of the tool moves downwardly relative to said head upon the bit 42 engagingr As best illustrated in Figure 11, the inner opposed faces of the portions 47 are cut to rovide recesses 49 for receiving correspon ingly shaped projections 50 of the head 41 so that when the parts are in operativey position an interlocking action between the parts is produced so that the rotation of the body of the tool 'will be imparted to the head 4l and, consequently, the bit 42. To aid in guiding the relative movement between the body of the tool and the spreader head and prevent any possibility of rotary movement between the parts, the spreader is provided on opposite sides thereof with the longitudinally extending ribs 56 which engage in correspondingly shaped recesses 57 formed in the sections 20 and 21 of the body.

The body of the tool, the spreader 32 and the head 41 are provided, respectively, with longitudinally extending bores 51, 52 and 53, which are all aligned and through which water may be introduced, as is customary, to the bottom of the bore, while the tool is in operation. The bore 5l in the body is provided with lateral openings '54, which also permit of water gaining access to the reamers 29 for the purpose of cleansing the same as they are operated.

It will be obvious from the foregoing description that, as the tool is lowered into the bore and the bit 42 comes in contact with the bottom of said bore, lfurther downward movement of the head 41 will be prevented, but owing to the relative position .of the head with respect to the body of the tool, the latter will be permitted to move downwardly until the upper end of the head engages the inner end of the opening 48. During this. relative movement the spreader, which supports the head 41 and is practically an integral part thereof, causes an outward lateral movement of the arms 25 about their pivots 26 by reason of the engagement of the inner portions of the free ends of said arms with the inclined surfaces of the head of the spreader. It will also be apparent that in the o eration of a tool of this character the wel casing 55 may be I so that the same will readily pass through the casing 55.

' What is claimed is:

1. In a well boring tool, a body, reamers movable laterally with respect thereto, a spreader for actuating said reamers, said spreader having opposed inclined surfaces for engagement with said rea-mers as the same are actuated in one direction, and means secured to said surfaces for regulating the amount of movement of said reamers in said direction.

2. In a well boring tool, a body, reamers movable laterally with respect thereto, and a spreader having a head provided with opposed faces having longitudinal grooves therein for receiving portions of the reamers when the same are being actuated aoopoa Q in one direction, and liners for varying the depth of said grooves whereby to regulate the amount of movement of said reamers in said direction.

tudinally, said head having a recess therein,

a spreader for actuating said reamers in l0 one direction and having a shank a portion of which extends into said recess, means' 6 3. In a-Well boring tool, a body, .reamers for securing said portion to said head, and movable laterally with respect thereto, a bit a resilient element interposed between said head supported by said body and with remeans and the bottom of said recess.

spect to which said body is movable longii WALTER JOHN ROGERS. 

